Efficient multi-keV X-ray generation from high-contrast laser plasma interaction
1 Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
2 Quantum Beam Science Directorate, Kansai Photon Science Institute Quantum Beam Science Directorate, Kansai Photon Science Institute , JAEA, Kyoto 619-0215, Japan
3 Institute for Laser Technology, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
4 Institute of Applied Physics and Computational Mathematics, PO Box 8009, Beijing 100088, China
5 Laser Research Center for Molecular Science, Institute for Molecular Science, National Institute of Natural Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
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Published online: 15 November 2013
Kα line emission from Mo was experimentally and theoretically studied using clean, ultrahigh-intensity femtosecond laser pulses. The absolute yields of Kα x-rays at 17 keV from Mo were measured as a function of the laser pulse contrast ratio and irradiation intensity. Significantly enhanced Kα yields were obtained by employing high contrast ratio at optimum irradiance. Conversion efficiencies of 4.28 × 10−5/sr, the highest values obtained to date, was demonstrated with contrast ratios in the range of 10−10 to 10−11.
© Owned by the authors, published by EDP Sciences, 2013
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